/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.druid.segment;

import com.fasterxml.jackson.databind.ObjectMapper;
import nl.jqno.equalsverifier.EqualsVerifier;
import org.apache.druid.jackson.DefaultObjectMapper;
import org.apache.druid.segment.data.BitmapSerdeFactory;
import org.apache.druid.segment.data.CompressionFactory;
import org.apache.druid.segment.data.CompressionFactory.LongEncodingStrategy;
import org.apache.druid.segment.data.CompressionStrategy;
import org.apache.druid.segment.data.RoaringBitmapSerdeFactory;
import org.junit.Assert;
import org.junit.Test;

import java.util.Map;

public class IndexSpecTest
{
  @Test
  public void testSerde() throws Exception
  {
    final ObjectMapper objectMapper = new DefaultObjectMapper();
    final String json =
        "{ \"bitmap\" : { \"type\" : \"roaring\" }, \"dimensionCompression\" : \"lz4\", \"metricCompression\" : \"lzf\""
        + ", \"longEncoding\" : \"auto\", \"stringDictionaryEncoding\":{\"type\":\"frontCoded\", \"bucketSize\":16}}";

    final IndexSpec spec = objectMapper.readValue(json, IndexSpec.class);
    Assert.assertEquals(RoaringBitmapSerdeFactory.getInstance(), spec.getBitmapSerdeFactory());
    Assert.assertEquals(CompressionStrategy.LZ4, spec.getDimensionCompression());
    Assert.assertEquals(CompressionStrategy.LZF, spec.getMetricCompression());
    Assert.assertEquals(CompressionFactory.LongEncodingStrategy.AUTO, spec.getLongEncoding());

    Assert.assertEquals(spec, objectMapper.readValue(objectMapper.writeValueAsBytes(spec), IndexSpec.class));
  }

  @Test
  public void testSerdeUncompressed() throws Exception
  {
    final ObjectMapper objectMapper = new DefaultObjectMapper();
    final String json = "{ \"dimensionCompression\" : \"uncompressed\" }";

    final IndexSpec spec = objectMapper.readValue(json, IndexSpec.class);

    Assert.assertEquals(CompressionStrategy.UNCOMPRESSED, spec.getDimensionCompression());
    Assert.assertEquals(spec, objectMapper.readValue(objectMapper.writeValueAsBytes(spec), IndexSpec.class));
  }

  @Test
  public void testDefaults()
  {
    final IndexSpec spec = IndexSpec.DEFAULT;
    Assert.assertEquals(CompressionStrategy.LZ4, spec.getDimensionCompression());
    Assert.assertEquals(CompressionStrategy.LZ4, spec.getMetricCompression());
    Assert.assertEquals(LongEncodingStrategy.LONGS, spec.getLongEncoding());
  }

  @Test
  public void testAsMap()
  {
    final ObjectMapper objectMapper = new DefaultObjectMapper();
    final IndexSpec spec = IndexSpec.DEFAULT;
    final Map<String, Object> map = spec.asMap(objectMapper);
    Assert.assertEquals(
        spec.getBitmapSerdeFactory(),
        objectMapper.convertValue(map.get("bitmap"), BitmapSerdeFactory.class)
    );
    Assert.assertEquals(
        spec.getDimensionCompression(),
        objectMapper.convertValue(map.get("dimensionCompression"), CompressionStrategy.class)
    );
    Assert.assertEquals(
        spec.getMetricCompression(),
        objectMapper.convertValue(map.get("metricCompression"), CompressionStrategy.class)
    );
    Assert.assertEquals(
        spec.getLongEncoding(),
        objectMapper.convertValue(map.get("longEncoding"), LongEncodingStrategy.class)
    );
  }

  @Test
  public void testEquals()
  {
    EqualsVerifier.forClass(IndexSpec.class)
                  .withPrefabValues(
                      IndexSpec.class,
                      IndexSpec.DEFAULT,
                      IndexSpec.builder()
                               .withJsonCompression(CompressionStrategy.ZSTD)
                               .build()
                  )
                  .usingGetClass()
                  .verify();
  }
}
